This could just be a passing interest and may be completely normal, particularly as it has only lasted for a short period. It does however sound a little obsessional, and obsessive compulsive behaviours can occur with ADHD. I would suggest that you take action only if it starts to interfere with normal functioning, for example, he wont go out and play, or do his homework because he has to count something first - that is, is he becoming obsessed with counting? If this starts to happen I would suggest that you see a child neurologist who would be able to assess him and alter the medication dosage if necessary.
Dr Peter Velloza
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